subscribe

$poe_kernel->post( spread => subscribe => 'chatroom' );
$poe_kernel->post( spread => subscribe => [ 'chatroom', 'testing' ] );
- The group name(s)
Subscribe to a Spread messaging group. Messages will be sent to C<_sp_message> and
join/leave/etc to C<_sp_admin> in the registered listeners.
Automatically adds the session to the registered listeners.
Will send a C<_sp_error> if unable to subscribe; C<_sp_admin> with join message if successful